  .roll {
    position: absolute;
    top: 100px;
    right: 200px;
    width: 120px;
    color: aliceblue;
    background: rgba(0, 0, 0, 0.5);
    border-radius: 10px;
    text-align: center;
    z-index: 99;
  }

  .roll .showVideo {
    width: 70px;
    height: 30px;
    line-height: 30px;
    margin: 5px 5px 5px 40px;
    font-size: 5px;
    background: url(~assets/images/button.png);
    background-size: 100% 100%;
  }

  .roll .showVideo:hover {
    cursor: pointer;
  }

  .roll .left {
    display: inline-block;
    margin-right: 5px;
    width: 40px;
    height: 40px;
    background: url(~assets/images/left.png);
    background-size: 100% 100%;
  }

  .roll .right {
    display: inline-block;
    margin-left: 5px;
    width: 40px;
    height: 40px;
    background: url(~assets/images/right.png);
    background-size: 100% 100%;
  }

  .camera {
    position: absolute;
    left: 50px;
    top: 50px;
    width: 150px;
    height: 70px;
    color: aliceblue;
    background: url(~assets/images/button.png);
    background-size: 100% 100%;
    line-height: 70px;
    text-align: center;
    z-index: 99;
  }